Philip lange



(No Model.)

- P. LANGE.

GORE FOR ELEGTRO'MAGNETS AND METHOD OF FORMING THE SA-MB. No. 366,408. Patented July 12, 1887.

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PHILIP LAlVGE, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR-TQ GEORGE' WESTINGHOUSE, JR., OF SAME PLACE.

A CORE For ELECTRO-MAGNETS AND Minion 0F FORMING THE SAME.

; SPECIPICATIONforming part of Letters Patent No. 366,408, dated July 12, 1887;

Application filed December 2, 1886. Serial No. 220,444. (No model.)

To all whom it may concern:

Be it known that I, PHILIP LANGE, a Sub- 'ject of the Emperor of Germany, residing in Pittsburg, in thecounty of. Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Co'rcs for Electrical Instruments and Method of Forming the Same, of which the following is a speci fication.

The invention relates to the construction of cores and armatures for electromagnetic apparatus-such, forinstance, as induction-coils, electrical converters, and electro-magnets in general.

The object of the invention is to provide a core or armature susceptible of rapid changes in its magnetic condition, and which will not become overheated by a rapid and continuous magnetic charge and discharge.

It has heretofore been proposed to form the cores of electro-magncts from compact bundles of soft-iron wires. For the purpose of the present invention it is desirable that such wires should be to a greater or less extent magnetically insulated from each other, and also that the wires should lie as nearly parallel as possible.

The invention therefore consists, in general terms, in constructing cores and armatu res in the following manner: A cylinder of suitable non-magnetic and non-conducting material such, for instance, as paper-4s wound con-- tinuously from end to end with a single helical layer of soft-iron wire oft-he required size. The cylinder is preferably first covered by a'eoatingof shellac, varnish, or similar material, and this serves, when dry and hard-- ened, to hold the wire in position. The cylinder thus formed is then cut apart or slit in the direction of its length, and the sheet thus formed is wound or wrapped into acon'volute, the wires lying parallel to its axis, the sheet being bent so that the non-conducting material will come inside. The bending of the paper in this manner will necessarily separate the wires from each other a greater or less distance, and these spaces may y'ith advantage be or cutting the sheet.

filled with an additional coating of shellac. This procedure secures a thorough magnetic separation and insulation of the wires.

In theaccompanying drawings, Figure 1 illustrates the method of forming the sheets. Fig. 2 illustrates the sheet after it has been cut apart, and Fig.3 illustrates a complete core.

Referring to the figures, A representsahollow cylinder, of paper or other similar flexible non-magnetic material. I It is preferably carried by a cylindrical block, B. This may be made compressible like a chuck, or it may be grooved lengthwise to facilitate removing The outer surface of the paper is first coated with any suitable varnish, shellac, or other suitable material, and

sheet is cut apartfor example, along the line" a a-and flattened out, as shown in Fig. 2. The, sheet or portions thereof, cutto the proper length and breadth, is then rolled up, in the manner shown in Fig. 3. This separates the wires slightly from each other, and the spaces thus formed are prefcrablyfillcd by the application of shellac or other equivalent material. Usually it is found desirable to coat the sheet with a coating of adhesive material, for which shellac or varnish answers the purpose well, and this serves to bind the convolntions together.

'A core of this character may be made of any desired form for any of the usual purposes of electro magnetic apparatus. The sheet may be w rapped on a uon-comlncting cylindcr-such as glass, for instance-whcnit is desired to produce a hollow core.

v, I claim as my invention-- 1. A core for electromagnetic apparatus, consisting of aconvolute of nonconducting material covered bywircs of soft iron.

2. A core for electromagnetic apparatus, consisting of a sheet of paper, or other non- -2- sse,4oa

magnetic n1:1teri;fl,c0vered with soft-inn) wires and \\'mpped,1ip0n itself} substantially as (14. scribed. 3. As an article of mmmtacture, 1 Shout t nonmngnc-tic non-conducting material ((A cred upon one siilc by wires of sol: iron, snh- H stantiaiiy as'descrihcd. v PHILIP LANGE 4; The hereiuhetore- (test-161ml method of i Witnesses: J

forming cores for elcetro-nmgmi-ts, which um I CH S A, TE

sheet, cutting the wires across their lengths, and wrapping the sheet upon itself, substantially as set forth.

I In testimony whereof I have hereunto snbi svr'ibed'my name this 29th day of October, A. :5 l

r0 sists in winding wire upon :1 mm (undue-ting l S. W, HARPER, 

